How can I make Syntastic load a different checker based on existance of files in root?

Question

At work we use a different syntax checker than I do when working on open source. Is there a way to have Syntastic specify a default checker, and change checkers if an rc file is found at the project root?

Example: if .eslintrc is found use eslint. If no .eslintrc is found, use standard.

Thanks!

edit: also opened an issue on scrooloose/syntastic.

Answer 1

Yes, you can do something like this:

autocmd FileType javascript let b:syntastic_checkers = findfile('.eslintrc', '.;') != '' ? ['eslint'] : ['standard']

Edit: Upon request, explanation of how this works:

• autocmd FileType javascript - run the following stuff every time the filetype of a buffer is set to javascript (that is, normally once per buffer)
• b:syntastic_checkers list of checkers enabled for the current buffer, overriding g:syntastic_javascript_checkers
• findfile('.eslintrc', ...) - find a file named .eslintrc ...
• .; - ... in the current directory and upwards
• != '' ? - if found...
• ['eslint'] - ... set b:syntastic_checkers to ['eslint']
• : ['standard'] - ... otherwise set it to ['standard']

Magic, I tell ya.

Answer 2

Another simple option, which has wider application than just this question, is to add the following to your .vimrc file:

if findfile('.lvimrc','.') != ''
    source .lvimrc
endif

Then in the directory where you want some different behavior, just add a '.lvimrc' file with the syntastic option that you want for that directory.